BS 161 Exam 1 PCQ-s & RIQ-s
Latest Study Question With
100% Verified Answers.
1. What are the functions of the cytoskeleton? - ANSWER To provides
scaffolding for the enzymes in certain areas of the cell, organize cells
activities, provide movement of molecules in the cell and provide the cell
shape
2. What are characteristics of desmosome? - ANSWER Destruction of
intermediate filaments by cancers of epithelial tissues, adds strength in
epithelial tissue of the top layer of the skin and allows flexibility when
stretching.
3. What characteristics of plasmodesmata? - ANSWER Penetrates the cell
walls to allow a pathway for movement and allows flow of ions between two
plant cells
4. What characteristics of gap junction? - ANSWER Allows immediate
communication between cells such as 2 neurons, allows types of smooth
muscle and cardiac muscle to contract in unison.
5. What characteristics of a tight junction? - ANSWER Resists the movement
of material into and out of capillaries in the brain. holds together endothelial
cells and seals epithelial cells to each other right beneath their surface on the
top layer of skin.
,6. Suppose a researcher successfully produced a membrane composed of
saturated triglycerides rather than from phospholipids. What characteristics
would you expect the saturated triglyceride membrane to have? - ANSWER
Hydrophobic molecules would be attracted to the membrane and the
saturated triglycerides would not form a bilayer
7. What do animal and plant cells have in common? - ANSWER Membrane is
a bilayer of phospholipids, transport proteins embedded in membrane and
they help the cell to maintain homeostasis
8. T/F
A triacylglycerol is composed of 3 glycerol molecules going to a fatty acid -
ANSWER FALSE
9. T/F
The fatty acids of a triglyceride need to be identical, and often they are very
different from one another - ANSWER TRUE
10.T/F
Glycerol is a 3-C alcohol, in which each carbon bears a carboxyl group -
ANSWER FALSE
11.T/F
A fatty acid consists of a hydrocarbon chain joined to a hydroxyl group -
ANSWER FALSE
12.T/F
The hydrocarbon chains of fatty acids vary in length as well as in the number
and location of double bonds b/t the carbon atoms - ANSWER TRUE
,13.T/F
Fatty acids with a one double bond in their hydrocarbon chain are called
monounsaturated, while those with more than one double bond are called
polyunsaturated - ANSWER TRUE
14.T/F
A saturated fatty acid has the maximum # of oxygen atoms bonded to its
hydrocarbon chain - ANSWER FALSE
15.T/F
Fats containing unsaturated fatty acids have high melting points b/c their fatty
acid chains bend at the double bonds, preventing them from packing closely
together - ANSWER FALSE
16.T/F
Most plant fats contain saturated fatty acids and therefore liquid at room
temperature. - ANSWER FALSE
17.T/F
Additional hydrogen atoms can be added to saturated fats, a process called
hydrogenation - ANSWER FALSE
18.T/F
When unsaturated fats are partially hydrogenated industrially, this can produce
trans fats which have been linked to elevated levels of how density lipoprotein
(LDL) "bad cholesterol" and lowered levels of high-density lipoprotein (HDL)
"good cholesterol" - ANSWER TRUE
, 19.Fats are excellent energy storage molecules because: - ANSWER They have
a relatively high ratio of energy storing C-H bonds
20.What are some characteristics of phospholipids - ANSWER They contain a
glycerol backbone, the phosphate head group is polar and the molecule is an
important part of cell membrane.
21.How do membranes form spontaneously? - ANSWER The hydrophobic
fatty acid tails on phospholipids are repelled by water.
22.The protein Ras is involved in 25% of all cancers, and is attached to
membranes through a covalent bond to a phospholipid. How does Ras
associate with membranes? - ANSWER Through an anchor
23.What are some properties of interior protein network? - ANSWER Helps
determine the overall shape of a cell
24.What are some properties of a phospholipid bilayer? - ANSWER Forms a
semipermeable barrier and can allow diffusion of gases
25.What are some properties of transmembrane protein? - ANSWER Can span
both layers of a membrane and can form channels to allow small molecules
to cross membranes
26.What are some properties of cell surface markers? - ANSWER Often
carbohydrates attached to a lipid or protein
27.Larger _____ float within the bilayer - ANSWER Proteins
Latest Study Question With
100% Verified Answers.
1. What are the functions of the cytoskeleton? - ANSWER To provides
scaffolding for the enzymes in certain areas of the cell, organize cells
activities, provide movement of molecules in the cell and provide the cell
shape
2. What are characteristics of desmosome? - ANSWER Destruction of
intermediate filaments by cancers of epithelial tissues, adds strength in
epithelial tissue of the top layer of the skin and allows flexibility when
stretching.
3. What characteristics of plasmodesmata? - ANSWER Penetrates the cell
walls to allow a pathway for movement and allows flow of ions between two
plant cells
4. What characteristics of gap junction? - ANSWER Allows immediate
communication between cells such as 2 neurons, allows types of smooth
muscle and cardiac muscle to contract in unison.
5. What characteristics of a tight junction? - ANSWER Resists the movement
of material into and out of capillaries in the brain. holds together endothelial
cells and seals epithelial cells to each other right beneath their surface on the
top layer of skin.
,6. Suppose a researcher successfully produced a membrane composed of
saturated triglycerides rather than from phospholipids. What characteristics
would you expect the saturated triglyceride membrane to have? - ANSWER
Hydrophobic molecules would be attracted to the membrane and the
saturated triglycerides would not form a bilayer
7. What do animal and plant cells have in common? - ANSWER Membrane is
a bilayer of phospholipids, transport proteins embedded in membrane and
they help the cell to maintain homeostasis
8. T/F
A triacylglycerol is composed of 3 glycerol molecules going to a fatty acid -
ANSWER FALSE
9. T/F
The fatty acids of a triglyceride need to be identical, and often they are very
different from one another - ANSWER TRUE
10.T/F
Glycerol is a 3-C alcohol, in which each carbon bears a carboxyl group -
ANSWER FALSE
11.T/F
A fatty acid consists of a hydrocarbon chain joined to a hydroxyl group -
ANSWER FALSE
12.T/F
The hydrocarbon chains of fatty acids vary in length as well as in the number
and location of double bonds b/t the carbon atoms - ANSWER TRUE
,13.T/F
Fatty acids with a one double bond in their hydrocarbon chain are called
monounsaturated, while those with more than one double bond are called
polyunsaturated - ANSWER TRUE
14.T/F
A saturated fatty acid has the maximum # of oxygen atoms bonded to its
hydrocarbon chain - ANSWER FALSE
15.T/F
Fats containing unsaturated fatty acids have high melting points b/c their fatty
acid chains bend at the double bonds, preventing them from packing closely
together - ANSWER FALSE
16.T/F
Most plant fats contain saturated fatty acids and therefore liquid at room
temperature. - ANSWER FALSE
17.T/F
Additional hydrogen atoms can be added to saturated fats, a process called
hydrogenation - ANSWER FALSE
18.T/F
When unsaturated fats are partially hydrogenated industrially, this can produce
trans fats which have been linked to elevated levels of how density lipoprotein
(LDL) "bad cholesterol" and lowered levels of high-density lipoprotein (HDL)
"good cholesterol" - ANSWER TRUE
, 19.Fats are excellent energy storage molecules because: - ANSWER They have
a relatively high ratio of energy storing C-H bonds
20.What are some characteristics of phospholipids - ANSWER They contain a
glycerol backbone, the phosphate head group is polar and the molecule is an
important part of cell membrane.
21.How do membranes form spontaneously? - ANSWER The hydrophobic
fatty acid tails on phospholipids are repelled by water.
22.The protein Ras is involved in 25% of all cancers, and is attached to
membranes through a covalent bond to a phospholipid. How does Ras
associate with membranes? - ANSWER Through an anchor
23.What are some properties of interior protein network? - ANSWER Helps
determine the overall shape of a cell
24.What are some properties of a phospholipid bilayer? - ANSWER Forms a
semipermeable barrier and can allow diffusion of gases
25.What are some properties of transmembrane protein? - ANSWER Can span
both layers of a membrane and can form channels to allow small molecules
to cross membranes
26.What are some properties of cell surface markers? - ANSWER Often
carbohydrates attached to a lipid or protein
27.Larger _____ float within the bilayer - ANSWER Proteins
